Куроґане Хаято

The stern captain of the EXE and the Dullahans, effectively giving him the 2nd most influence in the Inquisition's troops after Sougetsu himself. He is contracted to both Caligula and Maximilian, an unprecedented achievement in the Inquisition's history which helped him earn the title as "the strongest Witch Hunter".

Born as an abnormal "Hero Vessel" who boasted exceptional skill and intelligence, Kurogane expressed little to no emotions and only acted on efficiency. Kugorane was merciless and uncaring in his early days and was never shown to be shaken by any means and remained perfectly calm under any situation. He solely followed the written law of an Inquisitor and acted accordingly.

Through his late superior Kazuma's heavy-handed lessons, Kurogane strove to better himself and became more aware of those around him and he forged an inner "law" to live by. This inner code defined his entire life and he dedicated his talents in protecting innocent people. Should any opposition come against his law, he would unhesitatingly wipe them out, but by any means something was deemed justifiable for him to act, he would carry it out. This belief was so firmly entrenched in his mindset that it overshadowed other recognized rules and regulations, essentially placing his own judgment above everything else. His very presence inspires certain dread and admiration among his peers

(Source: Taimadou Gakuen 35 Wiki)